<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            background: url("./img/渐变图片.png") no-repeat fixed;
            background-size: cover; 
        }
        .box {
            height: 2000px;
            width: 100px;
            background-image: -webkit-linear-gradient(red,green,orange,blue,pink);
        }
    </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>